Update prerendercloud dep to reflect new API URL

- headless-render-api.com
- https://github.com/sanfrancesco/prerendercloud-nodejs/pull/32/files

Author: jotto

package-lock.json

@@ -6,6 +6,6 @@
     "serverless": "3.15.2"
   },
   "dependencies": {
-    "prerendercloud": "1.45.1"
+    "prerendercloud": "1.45.6"
   }
 }